| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it is difficult for [noun pl] | 6 |
|
| 2 | it is [adv] difficult for [noun pl] | 16 |
|
| 3 | it is [adv] difficult for [noun pl] | 15 |
|
| 4 | it is difficult for [adj] [noun pl] | 8 |
|
| 5 | it is difficult for [adj] [noun pl] | 7 |
|
| 6 | it is difficult for [noun pl] [verb] | 15 |
|
| 7 | it is difficult for [noun pl] [to-vb] | 14 |
|
| 8 | it is difficult for [noun pl] [prep] | 5 |
|
| 9 | it is difficult for [noun pl] [prep] | 5 |
|
